Stabilization of arsenic and lead by magnesium oxide (MgO) in different seawater concentrations
- Authors
- Kameda, Kentaro; Hashimoto, Yohey; Ok, Yong Sik
- Issue Date
- 2월-2018
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Periclase; Heavy metals; XAFS; Soil pollution; Sea level rise
- Citation
- ENVIRONMENTAL POLLUTION, v.233, pp.952 - 959
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENTAL POLLUTION
- Volume
- 233
- Start Page
- 952
- End Page
- 959
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/77909
- DOI
- 10.1016/j.envpol.2017.09.067
- ISSN
- 0269-7491
- Abstract
- Ongoing sea level rise will have a major impact on mobility and migration of contaminants by changing a number of natural phenomena that alter geochemistry and hydrology of subsurface environment. In-situ immobilization techniques may be a promising remediation strategy for mitigating contaminant mobility induced by sea level rise. This study investigated the reaction mechanisms of magnesium oxide (MgO) with aqueous Pb and As under freshwater and seawater using XAFS spectroscopy. Initial concentrations of Pb and As in freshwater strongly controlled the characteristics of the reaction product of MgO. Our study revealed that i) the removal of aqueous Pb and As by MgO was increased by the elevation of seawater concentration, and ii) the removal of As was attributed primarily to (inner-sphere) surface adsorption on MgO, independent on seawater concentrations, and iii) the retention mechanism of Pb was dependent on seawater concentrations where formations of Pb oxides and adsorption on the MgO surface were predominant in solutions with low and high salinity, respectively. The release of As fixed with MgO significantly increased in seawater compared to freshwater, although the amount of As desorbed accounted for <0.2% of total As. (C) 2017 Elsevier Ltd. All rights reserved.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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